SMALL BASE + EXTERNAL BRAKE + STD BARREL END CAP + STD INTERNAL BRAKE. BBG - NF#2 - O7SUGESTED CALIBERSelectADDED LENGTH (mm):172OVERALL LENGTH (mm):190DIAMETER (mm):50WEIGHT (g):445COMPONENTS SelectSUGESTED CALIBER.204 > .220 (-1) .243 > .270 (-2) ADDED LENGTH:172mm OVERALL LENGTH:190mm DIAMETER:50mm WEIGHT:445g THREADM12 X 1 M13 X 1 M14 X 1 M16 X 1 M18 X 1 & IMPERIAL